ASN Wikibase Occurrence # 138707
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| Date: | Sunday 25 September 2011 |
| Time: | 13:39 LT |
| Type: |  IPTN/Bell 412SP |
| Owner/operator: | Airfast Indonesia |
| Registration: | PK-OCV |
| MSN: | NB19/34019 |
| Year of manufacture: | 1991 |
| Fatalities: | Fatalities: 2 / Occupants: 2 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | near Kemilas, Ropang, Sumbawa -
 Indonesia
|
| Phase: | En route |
| Nature: | External load operation |
| Departure airport: | Dodo village |
| Lemarung village | |
| Investigating agency: | NTSC |
| Confidence Rating: |  Accident investigation report completed and information captured |
The helicopter had been flying on contract to PT. Newmont Nusa Tenggara Mining Company, since 5 August 2011. On 25 September 2011, the helicopter was conducting an external load / underslung load operation with a 50 feet long external cable. The flight route was between two camps at Lemurung and Dodo.
The crew consisted of one pilot and one load master.
At 0539 UTC, the helicopter took off to drop the load to Dodo and was returning to Lemurung with empty long-line hook. Approximately two minutes after the aircraft departed Dodo, the ground radio operator received a “MAYDAY MAYDAY” call on the company frequency. The Lemurung radio operator responded but no reply.
The examination of the cable (long-line) and the tail rotor blade provided evidence consistent with the tail rotor blade striking the cable. The cable strike, in turn, resulted in the tail rotor system entering an extreme out-of-balance condition, manifesting into loads that fractured the mounting bulkhead of the 90° gearbox and resulted an uncontrollable flight due to the significant shift to centre of gravity (CG).
Accident investigation:
 |
|
Sources:
http://www.dephub.go.id/knkt/ntsc_aviation/baru/Final%20Report%20PK-OCV.pdf
http://jakartaglobe.id/news/helicopter-missing-in-west-nusa-tenggara/467643
http://web.archive.org/web/20150919083447/http://lomboknews.com/2011/09/25/heli-bell-412-ocv-milik-air-fast-hilang-di-sumbawa/
http://web.archive.org/web/20130410035312/http://www.thejakartapost.com/news/2011/09/25/chopper-carrying-2-missing-sumbawa.html
https://www.liputan6.com/news/read/355122/helikopter-airfast-hilang-di-sumbawa
http://www.allvoices.com/contributed-news/10442182-helicopter-fall-victim-swiftly-flown-to-mataram
http://i527.photobucket.com/albums/cc356/AbahRayan/PK-OCV.jpg (photo)
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 25-Sep-2011 08:50 | gerard57 | Added |
| 25-Sep-2011 08:55 | gerard57 | Updated [Aircraft type, Source] |
| 25-Sep-2011 10:00 | gerard57 | Updated [Source, Narrative] |
| 25-Sep-2011 10:01 | gerard57 | Updated [Narrative] |
| 25-Sep-2011 19:44 | RobertMB | Updated [Registration, Source] |
| 26-Sep-2011 02:23 | gerard57 | Updated [Operator, Source, Damage, Narrative] |
| 26-Sep-2011 02:24 | gerard57 | Updated [Narrative] |
| 26-Sep-2011 05:59 | RobertMB | Updated [Time, Operator, Other fatalities, Location, Departure airport, Destination airport, Narrative] |
| 27-Sep-2011 12:44 | Anon. | Updated [Aircraft type, Cn] |
| 05-Feb-2013 09:13 | TB | Updated [Time, Aircraft type, Location, Source, Narrative] |
| 20-Jun-2014 09:48 | harro | Updated [Source, Narrative] |
| 20-Jun-2014 09:48 | harro | Updated [Nature] |
| 30-Sep-2016 16:32 | Aerossurance | Updated [Narrative] |
Corrections or additions? ... Edit this accident description
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